<template>
	<view v-if="goods_info.goods_name" class="goods-detail-container">
		<!-- 轮播图区域 -->
		<swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
			<swiper-item v-for="(item, i) in goods_info.pics" :key="i">
				<!-- 把当前点击的图片的索引，传递到preview()处理函数中 -->
				<image :src="item.pics_big" @click="preview(i)"></image>
			</swiper-item>
		</swiper>
		
		
		<!-- 商品信息区域 -->
			<view class="goods-info-box">
				<!-- 商品价格 -->
				<view class="price">￥{{goods_info.goods_price}}</view>
				<!-- 商品信息的主体区域 -->
				<view class="goods-info-body">
					<!-- 商品的名字 -->
					<view class="goods-name">{{goods_info.goods_name}}</view>
					<!-- 收藏 -->
					<view class="favi">
						<uni-icons type="star" size="18" color="gray"></uni-icons>
						<text>收藏</text>
					</view>
				</view>
				<!-- 运费 -->
				<view class="yf">快递：免运费</view>
			</view>
		
			<rich-text :nodes="goods_info.goods_introduce"></rich-text>
			
			<!-- 商品导航组件区域 -->
			<view class="goods-nav">
				<uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick"></uni-goods-nav>
			</view>
	</view>
</template>

<script>
	import { mapState,mapMutations,mapGetters } from 'vuex'
	
	export default {
		computed: {
			...mapState('m_cart', []),
			...mapGetters('m_cart', ['total'])
		},
		watch: {
			// 监听total值的变化,通过第一个形参得到变化后的新值
			// total(newVal) {
			// 	// 通过数组的 find()方法,找到购物车按钮的配置对象
			// 	const findResult = this.options.find(x => x.text === '购物车')
			// 	if(findResult) {
			// 		// 动态为购物车按钮的 info 属性赋值
			// 		findResult.info = newVal
			// 	}
			// }
			
			//定义total侦听器，指向一个配置对象
			total: {
				// handler属性用来定义侦听器的 function 处理函数
				handler(newVal) {
					// 通过数组的 find()方法,找到购物车按钮的配置对象
					const findResult = this.options.find(x => x.text === '购物车')
					if(findResult) {
						// 动态为购物车按钮的 info 属性赋值
						findResult.info = newVal
					}
				},
				//immediate属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
				immediate: true
			}
		},
		
		data() {
			return {
				goods_info: {},
				options: [{
					icon: 'shop',
					text: '店铺',
					infoBackgroundColor: '#ff0000',
					// infoColor: 'red'
				},{
					icon: 'cart',
					text: '购物车',
					info: 0
				}],
				buttonGroup: [{
					text: '加入购物车',
					backgroundColor: '#ff0000',
					color: '#fff'
				},{
					text: '立即购买',
					backgroundColor: '#ffa200',
					color: '#fff'
				}]
			}
		},
		onLoad(options) {
			const goods_id = options.goods_id
			this.getGoodsDetail(goods_id)
		},
		methods: {
			...mapMutations('m_cart', ['addToCart']),
			async getGoodsDetail(goods_id) {
				const {data: res} = await uni.$http.get('/api/public/v1/goods/detail', {goods_id})
				if(res.meta.status !== 200) return uni.$showMsg()
				
				res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;" ').replace(/webp/g, 'jpg')
				
				this.goods_info = res.message
			},
			//实现轮播图的预览效果
			preview(i) {
				// 调用uni.previewImage() 方法预览图片
				uni.previewImage({
					// 预览时,默认显示图片的索引
					current: i,
					// 所有图片 url 地址的数组
					urls: this.goods_info.pics.map(x => x.pics_big)
				})
			},
			//左侧按钮的点击事件处理函数
			onClick(e) {
				// console.log(e)
				if(e.content.text === '购物车') {
					//切换到购物车页面
					uni.switchTab({
						url: '/pages/cart/cart'
					})
				}
			},
			buttonClick(e) {
				// console.log(e)
				if(e.content.text === '加入购物车') {
					// 组织商品的信息对象
					// {goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state}
					const goods = {
						goods_id: this.goods_info.goods_id,
						goods_name: this.goods_info.goods_name,
						goods_price: this.goods_info.goods_price,
						goods_count: 1,
						goods_small_logo: this.goods_info.goods_small_logo,
						goods_state: true
						
					}
					
					// 调用 addToCart 方法
					this.addToCart(goods)
				}
			}
		}
	}
</script>

<style lang="scss">
	swiper{
		height: 750rpx;
		
		image{
			width: 100%;
			height: 100%;
		}
	}
	.goods-info-box{
		padding: 10px;
		padding-right: 0;
		
		.price{
			color: #C00000;
			font-size: 18px;
			margin: 10px 0;
		}
		
		.goods-info-body{
			display: flex;
			justify-content: space-between;
			
			.goods-name{
				font-size: 13px;
				margin-right: 10px;
			}
			
			.favi{
				width: 120px;
				font-size: 12px;
				display: flex;
				flex-direction: column;
				align-items: center;
				justify-content: center;
				border-left: 1px solid #efefef;
				color: gray;
			}
		}
		
		.yf{
			font-size: 12px;
			color: gray;
			margin: 10px 0;
		}
	}
	
	.goods-nav {
		position: fixed;
		bottom: 0;
		left: 0;
		width: 100%;
	}
	
	.goods-detail-container{
		padding-bottom: 50px;
	}
</style>
